Redmine not starting after ctlscript.sh start / stop

Hi,

We're currently using: BitNami Redmine 2.2.2-0 in the Cloud (amazon ec2). I successfully performed a backup using the wiki instructions. However, after restarting using the command "$ sudo ctlscript.sh start", Redmine no longer works and displays the error:

We're sorry, but something went wrong. We've been notified about this issue and we'll take a look at it shortly.

Nothing has been changed, only a backup was taken. This error is in the "/opt/bitnami/apache2/logs/error_log" multiple times:

[ pid=2263 thr=3053452096 file=ext/common/agents/HelperAgent/RequestHandler.h:1731 time=2013-04-24 00:51:38.5642 ]: [Client 22] Cannot checkout session. An error occured while starting up the preloader.
Error page:
Could not find gem 'spreadsheet (~> 0.6.8) ruby' in the gems available on this machine. (Bundler::GemNotFound)
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/resolver.rb:287:in `resolve'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/resolver.rb:161:in `start'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/resolver.rb:128:in `block in resolve'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/resolver.rb:127:in `catch'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/resolver.rb:127:in `resolve'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/definition.rb:178:in `resolve'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/definition.rb:113:in `specs'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/definition.rb:158:in `specs_for'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/definition.rb:147:in `requested_specs'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/environment.rb:23:in `requested_specs'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/runtime.rb:11:in `setup'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler.rb:116:in `setup'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.3/lib/bundler/setup.rb:17:in `<top (required)>'
  /opt/bitnami/ruby/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:60:in `require'
  /opt/bitnami/ruby/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:60:in `rescue in require'
  /opt/bitnami/ruby/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:35:in `require'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.9.1.beta/lib/phusion_passenger/loader_shared_helpers.rb:201:in `run_load_path_setup_code'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.9.1.beta/helper-scripts/rack-preloader.rb:70:in `preload_app'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.9.1.beta/helper-scripts/rack-preloader.rb:124:in `<module:App>'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.9.1.beta/helper-scripts/rack-preloader.rb:6:in `<module:PhusionPassenger>'
  /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/passenger-3.9.1.beta/helper-scripts/rack-preloader.rb:5:in `<main>'

Does anyone know how to fix this? Any help would be very much appreciated.

Thanks